Intermec CV30 TE 2000 Terminal Emulation Programmer's Guide - Page 244

Chapter 6 - Programming • Rolled over data and lines rolled out of the area are lost (cannot be rolled back onto screen). • The state of the keyboard and pending AID bytes are not affected. • The following conditions cause parameter errors: • A top line of zero. • A top line greater than or equal to the display length. • A bottom line of zero. • A bottom line greater than the display length. • A top line greater than or equal to the bottom line. • A roll area greater than the bottom line minus the top line. Write Error Code The Write Error Code command forces the computer into the prehelp state (the same state entered when an operator makes a keying error). Restrictions This clears any outstanding AID requests. The computer rejects this command if it is in the prehelp, system request, or SS messages state. Format The command may take any of the following forms. The Insert Cursor (IC) order may also be embedded in the error message. Note: You must provide either an Insert Cursor order or an error message or both to avoid an error. ESC Hex 04 Write Error Code Command Hex 21 Insert Cursor Order Position cursor ESC Hex 04 Write Error Code Command Hex 21 Error Message ESC Write Error Code Command Insert Cursor Order Error Message Hex 04 Hex 21 Position cursor You can use the IC order to place the cursor at the beginning of the field where the error occurred. This helps the operator find the source of the error. The IC order does not affect where the error message is written. The computer writes only the first 78 bytes of the error message to the error line. If the error line is used for error presentation, the computer saves data on the error line and restores it after the operator presses the Reset key. TE 2000TM Terminal Emulation Programmer's Guide 223